Hello,all.we are a PCB manufacturer.Material:FR-4,aluminium,FPC.Layer:
1-10,thickness:0.4-4.2mm,min.Line/Space:0.1mm,min.hole:0.1mm,inculding
burried/blind hole.Details pls send me email by hanward@szckt.cn or contact
me at:
Contacting:Hanward Jiang

Marketing Dept.Manager
Cirket Electronics Company
22A,Block B,Nanhai Bldg,Nanshan Rd,
Shenzhen,P.R.China
Tel:+86-755-8621 5150
Fax:+86-755-8621 5160
MSN:hanwardjiang@hotmail.com
Skype: hanward
Website:www.szckt.cn


Forrest W Christian-2 wrote:
> 
> I asked a similar question a while back, and that gave me some great 
> ideas, but I still haven't stumbled on quite the right solution.
> 
> Essentially I need to provide the functionality of a half-dozen or so 
> "Voltmeters" on a telemetry project I am working on.   For each 
> "voltmeter", I need to have a positive and negative input terminal - 
> just like a regular meter, and be able to read the positive or negative 
> voltage which appears across that pair of terminals.
> 
> Here's the problem:   The voltage sources may or may not be 
> interconnected with each other and/or the voltage source for the 
> telemetry instrument.  In addition, the voltage sources may be 
> interconnected but at a higher reference voltage - I.E. a high side 
> shunt or similar.   Think solar site where the instrument is powered 
> from the same batteries that you are measuring voltage from - and that 
> you're also measuring things like current shunts, and other devices at 
> the site (voltage outputs from other sensors).
> 
> In short, I need the functional equivalent of an instrumentation 
> amplifier which can be adjusted to measure input voltages over a wide 
> range (+-60V) and like I mentioned above may or may not be 
> interconnected electrically with the amplifier's power supply.   I'd 
> also like to do my best to make it "idiot-destruction" proof.
> 
> Cost is an issue...  I probably have a couple dollar budget for the 
> components for this section, although I could squeeze a bit more if I 
> found the exact right solution (I.E. a multi-input SPI Instrumentation 
> ADC which needs very few external components).
> 
> Accuracy isn't all that critical...  After all, I'm planning on feeding 
> this into a 12 bit ADC.
> 
> Ideas?
> 
> -forrest
> 
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